--- a/mozilla/security/sandbox/chromium/sandbox/linux/seccomp-bpf/trap.cc
+++ b/mozilla/security/sandbox/chromium/sandbox/linux/seccomp-bpf/trap.cc
@@ -155,7 +155,7 @@
   // most versions of glibc don't include this information in siginfo_t. So,
   // we need to explicitly copy it into a arch_sigsys structure.
   struct arch_sigsys sigsys;
-  memcpy(&sigsys, &info->_sifields, sizeof(sigsys));
+  memcpy(&sigsys, &info->si_addr, sizeof(sigsys));
 
 #if defined(__mips__)
   // When indirect syscall (syscall(__NR_foo, ...)) is made on Mips, the
